There are only official system requirements on the site which are released by developers or an official publisher.

Minimum system requirements:

CPU:

Pentium-II 500 MHz processor

RAM:

128 MB RAM

GPU:

16MB DirectX 8.1 compatible video card

DX:

DirectX 8.1

OS:

Windows 98, ME, 2000 or XP http://gamesystemrequirements.com/

Store:

930 MB hard drive space

Sound:

DirectX 8.1 compatible sound card

ODD:

8 speed CD-ROM drive

Recommended peripheral: keyboard, and mouse

Note: On huge, highly developed maps, the game is capable of swallowing 2GHz worth of processing \'power\' and still running slowly. However, basic gameplay, campaign and scenarios will not experience this, only custom maps such as Metropol and Gigapol, where the aim is basically to push the game to its limits and build ridiculously large cities.

The game's system requirements are extremely low that's why making a comparison is not feasible.